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Data ware house

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Data modeling, ER diagram

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keyboard

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computer key board कीबोर्ड-  आधुनिक कंप्यूटर कीबोर्ड का इतिहास टाइपराइटर के आविष्कार से प्रत्यक्ष विरासत के साथ शुरू हुआ था । क्रिस्टोफर लैथम शोल्स ने पहले व्यावहारिक आधुनिक टाइपराइटर का पेटेंट कराया था।  इसके तुरंत बाद, 1877 में, रेमिंगटन कंपनी ने पहले टाइपराइटर का बड़े पैमाने पर विपणन शुरू किया।  तकनीकी विकास की एक श्रृंखला के बाद, टाइपराइटर धीरे-धीरे मानक कंप्यूटर कीबोर्ड में विकसित हुआ था ।  It is primary input device.used text base. there are different type of key board. Alpha numeric - It is use for Enter no. & text. Punctuation- Use forEnter addionational key (),  : ,;   Navigation- It use for move to cursor. Special - Perform some special task ( f5, f8). Window- Use for open window like start menu. Function- Use for help. (f2). Numeric- Use for enter numeric no. Modification- used for enter to the capital letter. PC / AT-  pc/at introduced by  I.B.M. It had 84 key. 101 key board replaced it. 101 key board- Introduced by i.b.m. in ...
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